Pipe-coupling.



U. E. SCHMIDT. PIPE COUPLING. APPLICATION FILED DEO.14, 1906.

95 1], 9 7W4; Patented Mar. 8, 1910.

y ANNA WfT/VESSES: I [NVIi/VTOR Affol lneyj cHAnLns a. scnMrnr, or 'nAL'rIMonn' MARYLAND.

enigma.

To an whom it may concern:

Be it known that L'CHARLES-R. SCHMIDT,

a citizen of the United States, residing at Baltimore, in the State of Maryland, have lnvented certain new and useful Improvements in Pipe-Couplings, of whichthe following is a specification.

This invention has relation to pipe couplings, and relates in particular to couplings for-cast iron pipes of the faucet and spigot type, wherein the faucet or bowl and spigot ends of adjacent sections are tapered and machined or. ground to produce a tight oint. In couplings of this kind it has been customary to form the external surface of the spigot end and the internal surface of the faucet'end on the same taper. Theoretically this should produce a perfectly tight joint,

but it has been found that the constant wear of the tools employed in machining the joint sections, the expansion and contraction of the metal of which the sections are formed and other causes, render such joints, in a ma'ority of-cases, liable to leak and if made tig t at all they; are only made so by ere cessive strain, which often bursts the faucet end. Another defect quite common in couplings of the faucet and spigot type, is that the meetin parts not being erfectly joined so as to a ord'a considerabe area of'contacting surfaces, corrosion from chemical or electrolytic action results and -the joint is thereby rendered leaky. Another objectionable feature of this type of joint is that the several sections must, in order to secure a reasonably tight joint, be arranged with their longitudlnal axes in absolute alinement.

Tn carrying my invention into edect I so fashion or form one of the ends of each cast metal pipe section, preferably the spigot end, that it will possess sufficient elasticity to yield somewhat under the stress of the conjoint whether or not the meetin necting devices and provide a perfectly tight ends are perfectly machined or ground an permit of the sections being laid at somewhat of an angle to one another and also provide a surface contact of considerable area, so as to secure good electrical conductivity at the joint. I

l[ have illustrated my invention in the accompanying drawing wherein Figure 1 is a sectional view showing the faucet and spigot ends of the sections of pipe, separated. to clearly show the construction of each. Fig. 2 is a similar view of I PIPE-COUPLING.

Patented Mar. rain.

the same sections joined together. Fig. 3 is a view similar to Fig. 1, but showing a modi-' fied construction of my improvement. Fig. leis a view similar to Fi 2, of the construction shown in Fig. 3. Fig. 5 is a view similar to Figs. 2 and 4; of another modified form of'my improvement. Figs. 6 and 7 are views similar to Figs.'1,'-3 and 5 of other modified forms of my improvement. Fig. 8 is a sectional view of a modification.

In Figs. 1 and 2 the section having the faucet end is designated 1 and the section having the spigot end is designated 2 and these sections willh'ereinafter'be called the? faucet section and spigot section respectively. The faucet section 1 is provided with the faucet end 3, having the internally tapered socket 41-, and is also provided with the lateral flange 5, pierced at 6 for the passage of bolts 7, upon which are screwed nuts 8, these bolts and nuts serving toconnect and draw together the two sections as will be presently described. The .spigot section 2 is'provided with the externally tapered integralspigot end 9 and with the lateral flange 10, pierced at 11, for the passage of the bolts 7. V

It will be observed on careful inspection of the drawing that the socket 4c, in the faucet section 1, and the spigot end 9, of the spigot section 2, are difierently tapered, that is to say the angle of the internal wall of the-socket 4 is difierent from the angle of;

the external surface of the spigot end 9, the

Fill

another, although the angles may difier in a greater or less degree than that mentioned, iffound desirable or necessary. In addition to the above described construction I render the spigot end of the spigot section elastic 'in one of the several .Inanners hereinafter described and illustrated in the drawing.

. In Figs. 1 and 2 the spigot .end 9 of the spigot section is formed-with an elastic lip.12,,which is produced by forming the ed e of the spigot end inclined or inward y beveled as at 13, at an angle to the longitudinal axis of the section, such inclination or bevel extending from the outer to the inner surface of the spigot end. Tn Fig; 6, the same result is efiected,

thatis an elastic lip is producedat the edgi of the spigot end, but in this form the. end

of the lip is beveled as at14,-f-rom a point within the outer corner of the spigot end to the inner wall thereof, the bevel in this instance being at a more acute angle to the inner .surfaceof the spigot end than in Figs. 1 and 2.-

[In Figs. '2 and 3 the elastic lip 12 is produced by forming anannular-groove 15, of substantially V shape in cross section, in the edgeor extremity of the spigot end.

In Fig 5,the'outer edge of the cut away so. that the portion of the edge of the spigot end within the groove 15- Wlll project beyond the lip 12, this construction belng provided in order to protect the lip- 12 from injury during handling or trans portation of the pipe.

In Fig.7, the construction of the contacting surfaces of the spigotend and the faucet- .end of the pipe couphng is the same as in Figs. lto 6, but in this figure I have illustrated an application of my improvement to the coupling together of a wrought iron pipe and a cast iron T joint 17. The section 16 in this figure is formed with a screw thread 18,;and'with a spigot end 19 which latter .is comparatively elastic for the described purpose and is formed with a tapered external surface 20 the normal an le of this surface, before the jointis made, ing am more acute angle to the longitudinal axis of the pipe than the tapering surface 21 of the socketin the T joint-17, so that when the joint is made -the spigot .end of section 16' will be compressed inwardly so as to-cause the external surface of the spigot end to conform in its angle to that of the socketfrom'the extremity of the spigot end to 'a point considerably inthe rear thereof, or,

preferably throughout its entire surface. The T joint 17 is screw threaded to receive the screw threaded portion of the section" 16 and is formed asshown with. a socket and screw thread at the opposite end and with-a lateral branch, also formed with a similar screw thread and socket. i

In the form shown in Figs. 1 to 6, the lip v 12, is-compnessfedi ;inward1y when the pipe sections -ardrawn forcibly together by thebolts 7 and nuts 8, and thus the tapered surfaces of the spigot end and the socket inthe faucet end are made to conform and come into close contactthroughout a considerable portion of the length of both and thus produce a tightjjjoint andalso an extensive. em-

.face in close contact, thus securing good :contact for electric conduction. This effect.

of long contacting surfaces is secured. by

reason ofthe elasticity of the lip on .the spigot end even if the several pipe sections are at aii'sl'i ght angle to onejanother.

In the lgf'form shown in'Fig. '7', the entire lip 1215- spigot end is compressed when the pipe section. is screwed into the T joint and the desired effect thereby produced. In this form of con ling the taper of the socket, and the taper of the spigot or enterin' member are at different angles, as in the ot ier forms illustrated,

In Fig. 8, I showa' one of the coupling members instead of being :madeint'egral with the pipe section, is made in the form of a thimble 21, both sections of the pipe in this construction, being- .elastic externally tapered spigot end, in combination with a section having an inter-.

nally tapered open bowl, the taper of the eiplligot and the taper. of the bowl being at erent angles and the spigot having contact with the bowl at the outer angle only of the spigot section.

2. In a ipe coupling, the combination -with a mem or having an externally tapered spigot terminating at its end and outer angle in an elastic 1i of-a member having an internally tapere open bowl, the taper (.ofthe spigot and bowl; being at different angles and the spigot contacting with the bowl at theouter angle only of the spigot.

3. A cast metal pi e having, at one end, an "integral open bow with a tapered inner surface and at the other end an integral elastic, tapered, spigot,-. the taper of. the spigotand the taper of the bowl being in the same direction, and each in one direction only, the taper of the spigot beingof less pitch than the taper of the bowl.

A. A cast metal pipehaving at one end an integral interiorly tapered open bowl and at the other end an. integral elastic tapered spigot, the taper of the spigot and the taper of the bpwl being in one direction only and the taper of the spigot being of less pitch than the taper of thebowl.

5. In a pipe coupling, the combination said spigotend being formed with a groove in its edge, and an elastic lip outside of said groove a portion of the edge of the spigot end.- withm the groove projecting beyond said lip, of a faucet section having a socket. receiving modification in which with a spigot section having a spigot end, 

